Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 230
The Storm Prediction Center issued this mesoscale discussion at Mar 3, 2012, 9:12 AM CST for 9 counties in Florida; 30 counties in Georgia. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Mar 3, 2012, 9:12 AM CST (15:12 UTC)
- Expired
- Mar 3, 2012, 10:45 AM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 39 counties
Bay County, FL, Calhoun County, FL, Gadsden County, FL, Hamilton County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Thomas County, GA, Tift County, GA, Ware County, GA, Wayne County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.2 hours before the alert went out and 126 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 499 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 472 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 283 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 4.1
The text
As transmitted, in the capitals the NWS used until 2016.
956
ACUS11 KWNS 031513
SWOMCD
SPC MCD 031512
SCZ000-GAZ000-FLZ000-031645-
MESOSCALE DISCUSSION 0230
NWS STORM PREDICTION CENTER NORMAN OK
0912 AM CST SAT MAR 03 2012
AREAS AFFECTED...PARTS OF NRN FL...SE GA...AND SRN SOUTH CAROLINA
CONCERNING...TORNADO WATCH 68...
VALID 031512Z - 031645Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 68 CONTINUES.
THE REMAINDER OF WFO JACKSONVILLE COUNTIES NEAR AND NORTH OF THE
GEORGIA BORDER MAY NEED TO BE ADDED TO WW 68. WFO CHARLESTON SC
GEORGIA COUNTIES ARE BEING MONITORED FOR A POSSIBLE INCREASING
SEVERE THREAT WITHIN THE NEXT FEW HOURS.
STORMS ARE SLOWLY INTENSIFYING WITHIN A PRE-FRONTAL CONVECTIVE BAND
EXTENDING INLAND ACROSS THE FLORIDA PANHANDLE...THROUGH SOUTHERN
GEORGIA INTO THE LOWER SAVANNAH RIVER VALLEY AREA. PERHAPS MOST
PROMINENT IS AN EVOLVING CLUSTER TO THE WEST AND NORTH OF
TALLAHASSEE...WHICH MAY BE ASSOCIATED WITH AN AREA OF ENHANCED
FORCING FOR UPWARD VERTICAL MOTION COINCIDING WITH A WEAK FRONTAL
WAVE. THROUGH 17-19Z...THIS ACTIVITY APPEARS LIKELY TO ADVANCE EAST
NORTHEASTWARD ACROSS SOUTHERN GEORGIA AND ADJACENT NORTHERN
FLORIDA...TOWARD GEORGIA COASTAL AREAS TO THE SOUTH OF SAVANNAH.
EMBEDDED WITHIN A 40+ KT WEST SOUTHWESTERLY DEEP LAYER MEAN
FLOW...ALONG AND NORTH OF A 40+ KT 850 MB JET AXIS...IN THE PRESENCE
OF MIXED LAYER/MOST UNSTABLE CAPE ON THE ORDER OF 500 TO 1000
J/KG...POTENTIAL FOR DAMAGING WIND GUSTS MAY INCREASE THIS MORNING.
ALTHOUGH LOW-LEVEL HODOGRAPHS ARE NOT EXHIBITING PRONOUNCED
CLOCKWISE CURVATURE...SHEAR REMAINS STRONG ENOUGH TO SUPPORT A
CONTINUING RISK FOR ISOLATED TORNADOES...PARTICULARLY IN DISCRETE
CELLS FORMING JUST AHEAD OF THE DEVELOPING LARGER-SCALE CONVECTIVE
SYSTEM.
..KERR.. 03/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CHS...JAX...FFC...TAE...
LAT...LON 30298600 30848477 31718317 32168211 32508146 32268100
31518134 30678194 30268342 29908500 30298600SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 10:56 PM CST | Tornado Watch | SPC | Escambia | 6 hr |
| Mar 3, 4:47 AM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more | 58 min |
| Mar 3, 6:35 AM CST | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more | 6 hr |
| Mar 3, 11:45 AM CST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 15 more | 60 min |
| Mar 3, 12:04 PM CST | Tornado Watch | SPC | Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more | 5 hr |
| Mar 3, 3:30 PM CST | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Lafayette, Nassau, Suwannee and 2 more | 90 min |
| Mar 2, 7:15 PM CST | Mesoscale Discussion | SPC | Catoosa, Dade, Fannin, Gilmer, Murray, Rabun and 4 more | 90 min |
| Mar 2, 7:18 PM CST | Mesoscale Discussion | SPC | Dade | 57 min |
| Mar 2, 8:36 PM CST | Mesoscale Discussion | SPC | Baker, Calhoun, Colquitt, Cook, Decatur, Dougherty and 6 more | 54 min |
| Mar 2, 9:54 PM CST | Tornado Watch | SPC | Banks, Barrow, Bartow, Butts, Carroll, Catoosa and 61 more | 6 hr |
| Mar 2, 10:07 PM CST | Mesoscale Discussion | SPC | Carroll, Clayton, Cobb, Coweta, DeKalb, Douglas and 13 more | 113 min |
| Mar 2, 11:40 PM CST | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Carroll, Cherokee, Clarke and 30 more | 95 min |
| Mar 3, 2:58 AM CST | Mesoscale Discussion | SPC | Burke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 6 more | 92 min |
| Mar 3, 3:39 AM CST | Severe Thunderstorm Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 4 hr |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 2012Every mesoscale discussion in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.